Convert CONFIG_MISC_INIT_R to Kconfig

This converts the following to Kconfig:
   CONFIG_MISC_INIT_R

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Update the defaults logic slightly]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ti814x_evm_defconfig b/configs/ti814x_evm_defconfig
index 28ce6c7..b78dc7e 100644
--- a/configs/ti814x_evm_defconfig
+++ b/configs/ti814x_evm_defconfig
@@ -14,6 +14,7 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_BOOTDELAY=1
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
+# CONFIG_MISC_INIT_R is not set
 CONFIG_VERSION_VARIABLE=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set